The aims of our study are toxicity and symptom control evaluation of radiosurgery treatment delivered in multisession, for large or medium size intracranial meningiomas and/or for intracranial meningioma located at the critical sites (perichiasmatic area, perioptic area, PCA). We will evaluate also the efficacy of the treatment by volumetric analysis of treated meningiomas carrying out a volumetric comparison between pre- and post-radiosurgery treatment (every 6 month after treatment).